Getting Started with LibreOffice 3.3 - The Document Foundation Wiki

2) If you have not saved the document since the last change, a message box appears. Click
Yes to save the file.
3) After saving, you see the Digital Signatures dialog. Click Add to add a public key to the
document.
4) In the Select Certificate dialog, select your certificate and click OK.
5) You see again the Digital Signatures dialog, where you can add more certificates if you
want. Click OK to add the public key to the saved file.
A signed document shows an icon in the status bar. You can double-click the icon to view the
certificate.
Removing personal data
You may wish to ensure that personal data, versions, notes, hidden information, or recorded
changes are removed from files before you send them to other people or create PDFs from them.
In Tools → Options → LibreOffice → Security → Options, you can set LibreOffice to remind (warn)
you when files contain certain information and remove personal information automatically on
saving.
To remove personal and some other data from a file, go to File → Properties. On the General tab,
uncheck Apply user data and then click the Reset button. This removes any names in the created
and modified fields, deletes the modification and printing dates, and resets the editing time to zero,
the creation date to the current date and time, and the version number to 1.
To remove version information, either go to File → Versions, select the versions from the list and
click Delete, or use Save As and save the file with a different name.
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